Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3#include <sys/types.h>
   4#include <dirent.h>
   5
   6/*
   7 * These two functions should build up a graph in memory about
   8 * what objects we've referenced, and found, and types..
   9 *
  10 * Right now we don't do that kind of reachability checking. Yet.
  11 */
  12static void mark_needs_sha1(unsigned char *parent, const char * type, unsigned char *child)
  13{
  14}
  15
  16static int mark_sha1_seen(unsigned char *sha1, char *tag)
  17{
  18        return 0;
  19}
  20
  21static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
  22{
  23        while (size) {
  24                int len = 1+strlen(data);
  25                unsigned char *file_sha1 = data + len;
  26                char *path = strchr(data, ' ');
  27                if (size < len + 20 || !path)
  28                        return -1;
  29                data += len + 20;
  30                size -= len + 20;
  31                mark_needs_sha1(sha1, "blob", file_sha1);
  32        }
  33        return 0;
  34}
  35
  36static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
  37{
  38        int parents;
  39        unsigned char tree_sha1[20];
  40        unsigned char parent_sha1[20];
  41
  42        if (memcmp(data, "tree ", 5))
  43                return -1;
  44        if (get_sha1_hex(data + 5, tree_sha1) < 0)
  45                return -1;
  46        mark_needs_sha1(sha1, "tree", tree_sha1);
  47        data += 5 + 40 + 1;     /* "tree " + <hex sha1> + '\n' */
  48        parents = 0;
  49        while (!memcmp(data, "parent ", 7)) {
  50                if (get_sha1_hex(data + 7, parent_sha1) < 0)
  51                        return -1;
  52                mark_needs_sha1(sha1, "commit", parent_sha1);
  53                data += 7 + 40 + 1;     /* "parent " + <hex sha1> + '\n' */
  54                parents++;
  55        }
  56        if (!parents)
  57                printf("root: %s\n", sha1_to_hex(sha1));
  58        return 0;
  59}
  60
  61static int fsck_entry(unsigned char *sha1, char *tag, void *data, unsigned long size)
  62{
  63        if (!strcmp(tag, "blob")) {
  64                /* Nothing to check */;
  65        } else if (!strcmp(tag, "tree")) {
  66                if (fsck_tree(sha1, data, size) < 0)
  67                        return -1;
  68        } else if (!strcmp(tag, "commit")) {
  69                if (fsck_commit(sha1, data, size) < 0)
  70                        return -1;
  71        } else
  72                return -1;
  73        return mark_sha1_seen(sha1, tag);
  74}
  75
  76static int fsck_name(char *hex)
  77{
  78        unsigned char sha1[20];
  79        if (!get_sha1_hex(hex, sha1)) {
  80                unsigned long mapsize;
  81                void *map = map_sha1_file(sha1, &mapsize);
  82                if (map) {
  83                        char type[100];
  84                        unsigned long size;
  85                        void *buffer = NULL;
  86                        if (!check_sha1_signature(sha1, map, mapsize))
  87                                buffer = unpack_sha1_file(map, mapsize, type, &size);
  88                        munmap(map, mapsize);
  89                        if (buffer && !fsck_entry(sha1, type, buffer, size))
  90                                return 0;
  91                }
  92        }
  93        return -1;
  94}
  95
  96static int fsck_dir(int i, char *path)
  97{
  98        DIR *dir = opendir(path);
  99        struct dirent *de;
 100
 101        if (!dir) {
 102                fprintf(stderr, "missing sha1 directory '%s'", path);
 103                return -1;
 104        }
 105
 106        while ((de = readdir(dir)) != NULL) {
 107                char name[100];
 108                int len = strlen(de->d_name);
 109
 110                switch (len) {
 111                case 2:
 112                        if (de->d_name[1] != '.')
 113                                break;
 114                case 1:
 115                        if (de->d_name[0] != '.')
 116                                break;
 117                        continue;
 118                case 38:
 119                        sprintf(name, "%02x", i);
 120                        memcpy(name+2, de->d_name, len+1);
 121                        if (!fsck_name(name))
 122                                continue;
 123                }
 124                fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 125        }
 126        closedir(dir);
 127        return 0;
 128}
 129
 130int main(int argc, char **argv)
 131{
 132        int i;
 133        char *sha1_dir;
 134
 135        if (argc != 1)
 136                usage("fsck-cache");
 137        sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 138        for (i = 0; i < 256; i++) {
 139                static char dir[4096];
 140                sprintf(dir, "%s/%02x", sha1_dir, i);
 141                fsck_dir(i, dir);
 142        }
 143        return 0;
 144}